CN105281634B - A kind of motor demagnetization method and device - Google Patents
A kind of motor demagnetization method and device Download PDFInfo
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- CN105281634B CN105281634B CN201410347335.0A CN201410347335A CN105281634B CN 105281634 B CN105281634 B CN 105281634B CN 201410347335 A CN201410347335 A CN 201410347335A CN 105281634 B CN105281634 B CN 105281634B
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Abstract
The present invention relates to motor demagnetization technical field, the present invention provides a kind of motor demagnetization method and device, motor demagnetization method and comprised the following steps：When motor stopping, demagnetization processing is carried out to motor, in motor in degaussing process, feedback current on the dc bus of motor is detected, and judge whether feedback current is more than the first pre-set current value, when feedback current is less than the first pre-set current value, continue to carry out motor demagnetization processing until motor completes demagnetization, when feedback current is more than the first pre-set current value, the upper and lower bridge arm switching tube of frequency converter is closed in preset time, circulation performs abovementioned steps, until complete demagnetization, realize and controlled current flow controllable to time of motor demagnetization, and the erasing time can be manually set as needed, motor by demagnetization quickly enters rotating speed tracking, not only reduce the stand-by period of rotating speed tracking, the reliability of rotating speed tracking is also improved simultaneously.
Description
Technical field
The present invention relates to motor demagnetization technical field, more particularly to motor demagnetization method and device.
Background technology
When being started using transducer drive asynchronous machine, it is possible to run into the situation that motor is in rotation status.If become
Frequency device, which now normally starts, to cause the failures such as excessively stream or overload because slip is excessive.Chased after so being designed with rotating speed on frequency converter
Track function, specific is exactly the actual speed for being detected by hardware circuit motor, is started since the frequency.But increase is above-mentioned
Hardware circuit can increase cost, for the machine of small-power low price, occupy many costs, in addition in increase
State hardware circuit while interference can be increased in fabric swatch, make equipment can not normal operation.In order to solve the above problems, many producers
The method for beginning to use software rotating speed to follow the trail of, but due to still having remanent magnetism after motor stopping, it is necessary to wait for a period of time, etc.
Remanent magnetism reduce after can just start software rotating speed tracking, efficiency can be caused low, and remanent magnetism number it is different when, wait when
Between also differ, to software rotating speed tracking bring many uncertainties, greatly reduce software rotating speed tracking reliability.
In summary, need to wait remanent magnetism just to start the tracking of software rotating speed after reducing after motor stopping being in the prior art present, lead
The problem of causing the reliability of software rotating speed tracking low.
The content of the invention
It is an object of the invention to provide a kind of motor demagnetization method and device, it is intended to solves for prior art in motor
Need to wait remanent magnetism just to start the tracking of software rotating speed after reducing after shutdown, the reliability for causing software rotating speed to be followed the trail of is low to ask
Topic.
The present invention is achieved in that a kind of motor demagnetization method, and the motor works under the control of frequency converter, described
Motor demagnetization method comprises the following steps：
A. when motor stopping, demagnetization processing is carried out to motor；
B. in the motor in degaussing process, the feedback current on the dc bus of motor is detected, and judges
Whether the feedback current is more than the first pre-set current value；
C. when the feedback current is less than first pre-set current value, continue to carry out the motor demagnetization processing directly
Demagnetization is completed to the motor；
D. when the feedback current is more than first pre-set current value, the frequency converter is closed in preset time
Upper and lower bridge arm switching tube, return and perform the step A.
In the step A to motor carry out demagnetization processing the step of be specially：
The upper and lower bridge arm switching tube for driving frequency converter according to predetermined duty cycle turns on, to carry out demagnetization processing to motor.
The predetermined duty cycle is 50%.
Continue to carry out motor demagnetization processing until the motor is specially the step of completing demagnetization in the step C：
E. judge whether the feedback current is less than the second pre-set current value；
F. when the feedback current is more than second pre-set current value, continue to carry out demagnetization processing to the motor,
And return and perform step E；
G. when the feedback current is less than second pre-set current value, the upper and lower bridge arm switch of the frequency converter is closed
Pipe.
First pre-set current value is the rated current of frequency converter；
Second pre-set current value is the 30% of the rated current of frequency converter.
Another embodiment of the present invention provides a kind of motor degaussing gear, and the motor works under the control of frequency converter,
The motor degaussing gear includes：
Driver element, for carrying out demagnetization processing to motor in motor stopping；
Current detecting unit, in the motor in degaussing process, to the feedback current on the dc bus of motor
Detected；
Judging unit, for judging whether the feedback current is more than the first pre-set current value, when the feedback current is small
When first pre-set current value, continue to carry out motor demagnetization processing until the motor completes demagnetization；When the feedback
When electric current is more than first pre-set current value, the driver element is driven to close the upper and lower of the frequency converter in preset time
Bridge arm switching tube, then drive the driver element to start working.
The driver element carries out demagnetization processing to motor：
The upper and lower bridge arm switching tube for driving frequency converter according to predetermined duty cycle turns on, to carry out demagnetization processing to motor.
The predetermined duty cycle is 50%.
The judging unit is judged when the feedback current is less than the first pre-set current value, continues to carry out demagnetization to motor
Processing is until motor completion demagnetization is specially：
Judge whether the feedback current is less than the second pre-set current value；
When the feedback current is more than second pre-set current value, continue to carry out demagnetization processing to the motor；
When the feedback current is less than second pre-set current value, the driver element is driven to close the frequency converter
Upper and lower bridge arm switching tube.
First pre-set current value is the rated current of frequency converter；
Second pre-set current value is the 30% of the rated current of frequency converter.
The present invention provides a kind of motor demagnetization method and device, by control the IGBT of frequency converter realize the time it is controllable with
And controlled current flow, the erasing time can be manually set as needed, and 0.07- will be set as the erasing time according to the size of remanent magnetism automatically
Between 0.3 second, the motor by demagnetization quickly enters rotating speed tracking, not only reduces the stand-by period of rotating speed tracking, while
Improve the reliability of rotating speed tracking.
Brief description of the drawings
Technical scheme in order to illustrate the embodiments of the present invention more clearly, below will be to embodiment or description of the prior art
In the required accompanying drawing used be briefly described, it should be apparent that, drawings in the following description be only the present invention some
Embodiment, for those of ordinary skill in the art, without having to pay creative labor, can also be according to these
Accompanying drawing obtains other accompanying drawings.
Fig. 1 is the flow chart for the motor demagnetization method that an embodiment of the present invention provides；
Fig. 2 is the flow chart for the motor demagnetization method that another embodiment of the present invention provides；
Fig. 3 is the electric moter voltage waveform diagram for not carrying out demagnetization in the prior art；
Fig. 4 is the electric moter voltage waveform diagram for the motor demagnetization method that another embodiment of the present invention provides；
Fig. 5 is the structural representation for the motor degaussing gear that another embodiment of the present invention provides.
Embodiment
In order to make the purpose , technical scheme and advantage of the present invention be clearer, it is right below in conjunction with drawings and Examples
The present invention is further elaborated.It should be appreciated that the specific embodiments described herein are merely illustrative of the present invention, and
It is not used in the restriction present invention.
In order to illustrate technical scheme, illustrated below by specific embodiment.
An embodiment of the present invention provides a kind of motor demagnetization method, as shown in figure 1, motor demagnetization method includes following step
Suddenly：
S101. when motor stopping, demagnetization processing is carried out to motor；
S102. in motor in degaussing process, the feedback current on the dc bus of motor is detected, and judged anti-
Whether supply current is more than the first pre-set current value；
S103. when feedback current is less than the first pre-set current value, continue to carry out motor demagnetization processing until motor is complete
Into demagnetization；
S104. when feedback current is more than the first pre-set current value, the upper and lower bridge arm of frequency converter is closed in preset time
Switching tube, return and perform step S101.
In step S101, it is specially to the step of motor progress demagnetization processing：Frequency converter is driven according to predetermined duty cycle
Upper and lower bridge arm switching tube conducting, with to motor carry out demagnetization processing.
In step S101, motor can produce three-phase sine wave voltage signal when shutting down, and receive three-phase sine wave voltage
Signal, and drive signal is produced after handling three-phase sine wave voltage signal, drive the upper and lower bridge arm switching tube of frequency converter
Conducting turns on according to predetermined dutycycle, to carry out demagnetization to motor.
Preferably, it is that the 50% upper bridge arm of driving and lower bridge arm turn on according to predetermined duty cycle in step S101.
In step s 102, when carrying out demagnetization to motor, the remanent magnetism on motor can be fed back on frequency changer direct current bus
Or accelerate consumption on motor, now, the feedback current on dc bus is detected, and it is pre- to judge whether feedback current is more than first
If current value.
Preferably, the first pre-set current value is the rated current of frequency converter.
In step s 103, continue to carry out motor demagnetization processing until motor is specially the step of completing demagnetization：
S201. judge whether feedback current is less than the second pre-set current value；
S202. when feedback current is more than the second pre-set current value, continue to carry out demagnetization processing to motor, and return to execution
Step S201；
S203. when feedback current is less than the second pre-set current value, the upper and lower bridge arm switching tube of frequency converter, completion pair are closed
The demagnetization of motor.
In step S201, step S202 and step S203, it is preferred that the second pre-set current value is frequency converter rated current
30%.
In step S203, when feedback current is less than the second pre-set current value, that is, confirm to complete demagnetization, can be according to setting
Determine the size control erasing time of remanent magnetism, avoid in the prior art due to not can determine that remanent magnetism number, and can not determine
The problem of time treated brings many uncertainties to the tracking of software rotating speed.
When existing big wound AC70-132KW frequency converters drive 132KW motor operations, by testing normal 132KW motors
Freely shut down when running to 50Hz, it is necessary to, it is necessary to wait 5-7 seconds could thoroughly eliminate motor when the tracking of software rotating speed is restarted
Remanent magnetism, if starting motor by force, frequency converter overcurrent or tracking are may result in less than frequency.The present invention is applied into the motor
On, using the demagnetization function in the present invention, the process of demagnetization continue for 0.3 second, and the electric current in degaussing process continues in frequency converter
Within 1.2 times of rated current, complete the process of whole rotating speed trackings only need to improve rotating speed tracking less than the time of 1 second
Reliability and real-time.
Implement the present invention on AC70-55kw frequency converters again, the erasing time is only 0.07 second, and electric current is also in controlled range
It is interior.
Identical experiment is done in AC70 complete serieses 0.75kw-400kw machine again, experiment effect proves the present invention
There is extraordinary effect in terms of reliability and real-time to improving the tracking of software rotating speed.
As shown in Figure 3 and Figure 4, the voltage oscillogram for the stand-by period that improper startup and normal demagnetization start is given.
It is voltage-duration when this waveform is not turned on demagnetization function in Fig. 3, it is necessary to wait voltage to be reduced to relatively low journey
Degree can just carry out rotating speed tracking and start, and otherwise failure can be reported can not to obtain normal waveform.When right side Δ X is continues in Fig. 3
Between, general 4 seconds.
Voltage waveform leading portion in Fig. 4 is disappearance waveform, per small 90 milliseconds of lattice, probably continues 300 milliseconds.Rear end is normal
Rotating speed follows the trail of waveform, and now starting current is smaller, starts more steady.
Another embodiment of the present invention provides a kind of motor degaussing gear, and motor degaussing gear includes：
Driver element 301, for carrying out demagnetization processing to motor in motor stopping；Current detecting unit 302, for
The motor detects in degaussing process to the feedback current on the dc bus of motor；
Judging unit 303, for judging whether feedback current is more than the first pre-set current value, when feedback current is less than first
During pre-set current value, continue to carry out motor demagnetization processing until motor completes demagnetization；When feedback current is more than the first default electricity
During flow valuve, driving driver element 301 closes the upper and lower bridge arm switching tube of the frequency converter in preset time, then drives driving single
Member 301 is started working.
Driver element 301 carries out demagnetization processing to motor：
The upper and lower bridge arm switching tube for driving frequency converter according to predetermined duty cycle turns on, to carry out demagnetization processing to motor.
Preferably, predetermined duty cycle 50%.
Judging unit 303 is judged when feedback current is less than the first pre-set current value, continues to carry out demagnetization processing to motor
Until motor completion demagnetization is specially：
Judge whether feedback current is less than the second pre-set current value；
When feedback current is more than the second pre-set current value, continue to carry out demagnetization to motor；
When feedback current is less than the second pre-set current value, driving driver element 301 closes the upper of the frequency converter
Lower bridge arm switching tube, completes the demagnetization to motor.
Preferably, the first pre-set current value is the rated current of frequency converter；
Preferential, the second pre-set current value is the 30% of the rated current of frequency converter.
It is fast to realize that the present invention proposes a kind of motor demagnetization method on the basis of the software rotating speed tracking of existing standard
Fast rotating speed tracking, to be waited for a period of time when following the trail of and starting can just start to follow the trail of in the prior art, since it is desired that waiting surplus
Magnetic is reduced to the amplitude that will not cause excessively stream, and the period of wait is different according to the power grade of motor, constrains software
Rotating speed tracking function uses.The time is controllable and the demagnetization side of controlled current flow by controlling the IGBT of frequency converter to realize by the present invention
Method, is manually set the erasing time as needed, and system will be set as the 0.07-0.3 seconds erasing time automatically according to the size of remanent magnetism
Between, the motor by demagnetization quickly enters rotating speed tracking, not only reduces the stand-by period of rotating speed tracking, also improves simultaneously
The reliability of rotating speed tracking.
Another embodiment of the present invention, during frequency converter is again started up motor, under motor normal operation
During unexpected power down, controlled between motor and busbar voltage by the torque current of controller output, motor is according to current fortune
Row state, part kinetic energy is fed back on bus capacitor, maintain busbar voltage, be not enough to remain female until motor speed is reduced to
Line voltage, and the current rotating speed of motor is constantly passed into speed control, busbar voltage controller is switched back into speed control
During device, electric current is not undergone mutation.
It should be noted that above content is made for the present invention further detailed with reference to specific preferred embodiment
Explanation, it is impossible to assert that the specific implementation of the present invention is confined to these explanations.For the common skill of the technical field of the invention
For art personnel, some equivalent substitutes or obvious modification, and performance or use are made without departing from the inventive concept of the premise
It is identical on the way, it should all be considered as belonging to the scope of patent protection that the present invention is determined by the claims submitted.
Claims (10)
1. a kind of motor demagnetization method, the motor work under the control of frequency converter, it is characterised in that the motor demagnetization side
Method comprises the following steps：
A. when motor stopping, demagnetization processing is carried out to motor；
B. in the motor in degaussing process, the feedback current on the dc bus of motor is detected, and described in judgement
Whether feedback current is more than the first pre-set current value；
C. when the feedback current is less than first pre-set current value, continue to carry out the motor demagnetization processing until institute
State motor and complete demagnetization；
D. when the feedback current is more than first pre-set current value, the upper and lower of the frequency converter is closed in preset time
Bridge arm switching tube, return and perform the step A.
2. motor demagnetization method as claimed in claim 1, it is characterised in that carried out in the step A to motor at demagnetization
The step of reason is specially：
The upper and lower bridge arm switching tube for driving frequency converter according to predetermined duty cycle turns on, to carry out demagnetization processing to motor.
3. motor demagnetization method as claimed in claim 2, it is characterised in that the predetermined duty cycle is 50%.
4. motor demagnetization method as claimed in claim 1, it is characterised in that continue to disappear to motor in the step C
Magnetic treatment is until the motor is specially the step of completing demagnetization：
E. judge whether the feedback current is less than the second pre-set current value；
F. when the feedback current is more than second pre-set current value, continue to carry out demagnetization processing to the motor, and return
Receipt row step E；
G. when the feedback current is less than second pre-set current value, the upper and lower bridge arm switching tube of the frequency converter is closed.
5. motor demagnetization method as claimed in claim 4, it is characterised in that
First pre-set current value is the rated current of frequency converter；
Second pre-set current value is the 30% of the rated current of frequency converter.
6. a kind of motor degaussing gear, motor work under the control of frequency converter, it is characterised in that the motor degaussing gear bag
Include：
Driver element, for carrying out demagnetization processing to motor in motor stopping；
Current detecting unit, in degaussing process, being carried out in the motor to the feedback current on the dc bus of motor
Detection；
Judging unit, for judging whether the feedback current is more than the first pre-set current value, when the feedback current is less than institute
When stating the first pre-set current value, continue to carry out motor demagnetization processing until the motor completes demagnetization；When the feedback current
During more than first pre-set current value, the driver element is driven to close the upper and lower bridge arm of the frequency converter in preset time
Switching tube, then drive the driver element to start working.
7. motor degaussing gear as claimed in claim 6, it is characterised in that the driver element carries out demagnetization processing to motor
Specially：
The upper and lower bridge arm switching tube for driving frequency converter according to predetermined duty cycle turns on, to carry out demagnetization processing to motor.
8. motor degaussing gear as claimed in claim 7, it is characterised in that the predetermined duty cycle is 50%.
9. motor degaussing gear as claimed in claim 6, it is characterised in that the judging unit judges to work as the feedback current
During less than the first pre-set current value, continue to carry out motor demagnetization processing until motor completion demagnetization is specially：
Judge whether the feedback current is less than the second pre-set current value；
When the feedback current is more than second pre-set current value, continue to carry out demagnetization processing to the motor；
When the feedback current is less than second pre-set current value, the driver element is driven to close the upper of the frequency converter
Lower bridge arm switching tube.
10. motor degaussing gear as claimed in claim 9, it is characterised in that
First pre-set current value is the rated current of frequency converter；
Second pre-set current value is the 30% of the rated current of frequency converter.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410347335.0A CN105281634B (en) | 2014-07-21 | 2014-07-21 | A kind of motor demagnetization method and device |
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| CN201410347335.0A CN105281634B (en) | 2014-07-21 | 2014-07-21 | A kind of motor demagnetization method and device |
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| CN105281634A CN105281634A (en) | 2016-01-27 |
| CN105281634B true CN105281634B (en) | 2018-03-06 |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108809199B (en) * | 2018-06-13 | 2021-05-18 | 上海诺雅克电气有限公司 | Method and device for tracking motor rotation speed by frequency converter and frequency converter |
| CN110492800B (en) * | 2019-07-25 | 2021-05-11 | 江苏科技大学 | Device for eliminating residual magnetism by diode freewheeling of permanent magnet synchronous motor and using method |
| CN111676646A (en) * | 2020-05-21 | 2020-09-18 | 四川虹美智能科技有限公司 | Shutdown control method and device for washing machine |
| CN113507237B (en) * | 2021-07-21 | 2023-03-21 | 中冶赛迪工程技术股份有限公司 | Method for optimizing frequency converter runaway starting |
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| US8134329B2 (en) * | 2006-04-13 | 2012-03-13 | International Rectifier Corporation | Buck converter with improved filter design |
| CN101121482A (en) * | 2006-08-10 | 2008-02-13 | 东芝电梯株式会社 | Control device of elevator |
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